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Roll is controlled by the series of washers positioned at each side of the fulcrum as shown in your photo. As the vehicle rolls the fulcrum is pushed to one or other side. When the taper of the Bellville washers is placed face to face or back to back some compression is possible, but the more of the washers that are placed one on top of the other, with their tapers facing the same way, the less compression is possible & the more roll is resisted....so to adjust you change the order of the washers....but you probably know this already & i have probably misunderstood your enquiry
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